FormerEastEndersstars have joined detectives in appealing for information after the death of Gemma McCluskie, the soap star whose dismembered body was found in London's Regent's Canal. Her 35-year-old brother, Tony, remains in police custody for questioning.

Officers are reviewing CCTV footage of the actress attending the opening of the new £650m Royal London Hospital in Whitechapel, east London, last Thursday. Detective Superintendent Fiona Mallon, who is leading the Scotland Yard investigation, said: "It is important that we piece together Gemma's movements from Wednesday, 29 February, until the discovery in Regent's Canal in Hackney on Tuesday.

"We also urge anyone with any significant information about this case to contact us as soon as possible. In particular, we would like to hear from anyone who may have seen any suspicious activity around her home address in Pelter Street in Bethnal Green."

The 29-year-old, who played Kerry Skinner in the soap, was reported missing to police two days after her disappearance. Her torso was found when a member of the public reported a suspicious object floating close to Hackney's Broadway Market. Police divers are still searching for her remaining body parts.

The actress was pictured at the hospital event wearing a yellow long-sleeved blouse with a round neck and navy-blue leggings. She was also carrying a two-tone Louis Vuitton bag with beige handles. Her BlackBerry mobile phone, which had a white case, has not been recovered.

The former EastEnders co-stars Natalie Cassidy and Brooke Kinsella both appealed on Twitter for help in finding her.